20109539 has 2 divisors, whose sum is σ = 20109540. Its totient is φ = 20109538.

The previous prime is 20109517. The next prime is 20109553. The reversal of 20109539 is 93590102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20109539 - 2¹² = 20105443 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20109139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10054769 + 10054770.

It is an arithmetic number, because the mean of its divisors is an integer number (10054770).

Almost surely, 2^20109539 is an apocalyptic number.

20109539 is a deficient number, since it is larger than the sum of its proper divisors (1).

20109539 is an equidigital number, since it uses as much as digits as its factorization.

20109539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2430, while the sum is 29.

The square root of 20109539 is about 4484.3660644510. The cubic root of 20109539 is about 271.9364173396.

The spelling of 20109539 in words is "twenty million, one hundred nine thousand, five hundred thirty-nine".